Numerical Simulation On Vertical Spread Of Exterior Wall Fire In High-rise Building With Corridor

The high-rise building is one of the common building forms in our country.The high-rise building with corridor is a typical building form.There are corridor and side wall in high-rise buildings with corridor.In case of fire,because of chimney effect,it will speed up the spread of fire on the facade of the building and cause great harm to life and property.Therefore,it is very important to study the fusion height and change rule of multi window plume flame in high-rise building with corridor under fire environment.In this paper,the vertical multi window plume flame fusion of high-rise building with corridor is simulated,and the fire model of 18 story full-scale residential building is established by using pyrosim.By changing the distance from corridor to facade,ventilation factor,fire load and the number of vertical windows,the vertical temperature distribution of fire spread is analyzed based on the data of simulation software At the same time,the dangerous temperature T₁ and T₂are introduced to reveal the rule of fusion and spread of vertical continuous multi window plume flame and external insulation material.Through the analysis of the critical temperature of high-rise building’s external wall fire and external wall thermal insulation material burning and the critical temperature of window glass breaking,compared with the vertical continuous three windows,the vertical continuous two windows,the vertical continuous two windows are significantly higher than the single window,but the vertical continuous four windows are higher than the vertical continuous three windows It is basically the same,so the fire fusion height of vertical continuous three windows is considered as the theoretical basis of fire spread prevention and control measures for the facade of high-rise building with corridor.The results show that with the increase of the width of the corridor to the facade,the height of the limit dangerous temperature T₁ and T₂ of vertical continuous multi window flame fusion decreases.For the fire spreading of the facade of the high-rise building with corridor,the distance from the corridor to the facade,the number of vertical windows and the fire load should be considered comprehensively The influence of factors on the height of dangerous temperature T₁ and T₂,combined with all factors,the height of the limit temperature of the fire spread of the facade is 15.3m.